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@gbj_tester
Chain tension is about 10 times (depending on sprocket size) the horizontal reaction at the tyre/road contact, normal load at the contact patch is about 3 times the horizontal reaction (for μ=0.33, a tolerable approximation), the resultant of these 3 forces plus the (unknown) dropout reaction is zero if the wheel is not accelerating. It's an elementary problem in mechanics which anybody with O level maths will be able to solve. You don't even need to have a clue about the absolute magnitude of the forces, just their ratio.